HJC Mech Hunter Men's CL-17 Street Racing Motorcycle Helmet - MC-4F / 2X-Large Advanced Polycarbonate Composite Shell: Lightweight, superior fit and comfort using advanced CAD technology ACS Advanced Channeling Ventilation System: Full front to back airflow flushes heat and humidity up and out Optically-superior Pinlock-prepared Face Shield: New 3D design anti-scratch coating and is prepared for the ultimate anti-fog system. Pinlock lens sold separately RapidFire Shield Replacement System: Simple and secure shield ratchet system provides ultra-quick, tool-less removal and installation for efficient operation SuperCool Interior: Moisture-wicking and fabric. Crown and cheek pads are fully removable and washable. All CL-17 cheek pads are interchangeable throughout all helmet sizes